>Is there an easy way to scan the contents of a memo field, similar to "DO WHILE NOT FEOF()", without copying the contents to a temporary file?

You can use ALINES() function. See help for details.

LOCAL lnLines, laLines[1], lnI
lnLines = ALINES(laLines, Mytable.Mymemo)
FOR lnI=1 TO lnLines
    * Do processing here
ENDFOR